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2. Messier object - Wikipedia

   en.wikipedia.org/wiki/Messier_object

   For example, Messier 1 is a supernova remnant, known as the Crab Nebula, and the great spiral Andromeda Galaxy is M31. Further inclusions followed; the first addition came from Nicolas Camille Flammarion in 1921, who added Messier 104 after finding Messier's side note in his 1781 edition exemplar of the catalogue.

3. List of astronomical catalogues - Wikipedia

   en.wikipedia.org/wiki/List_of_astronomical...

   Mayall — Nicholas Mayall (for example: globular star cluster Mayall II orbiting Messier 31, the Andromeda galaxy) Mayer (open star clusters) McC — McCormick Observatory Catalog; MCG — Morphological Catalogue of Galaxies; MCW — Morgan, Code, and Whitford [26] Me — Merrill (planetary nebulae)

4. Timeline of astronomical maps, catalogs, and surveys

   en.wikipedia.org/wiki/Timeline_of_astronomical...

   c. 350 BC — Shi Shen's star catalog has almost 800 entries; c. 300 BC — star catalog of Timocharis of Alexandria; c. 134 BC — Hipparchus makes a detailed star map; c. 150 — Ptolemy completes his Almagest, which contains a catalog of stars, observations of planetary motions, and treatises on geometry and cosmology

5. Messier 102 - Wikipedia

   en.wikipedia.org/wiki/Messier_102

   Messier 102 (also known as M102) is a galaxy listed in the Messier Catalogue that cannot be unambiguously identified. Its original discoverer Pierre Méchain retracted his discovery two years after publication and said that it was a duplicate observation of Messier 101 . [ 1 ]

6. Andromeda Galaxy - Wikipedia

   en.wikipedia.org/wiki/Andromeda_Galaxy

   The Andromeda Galaxy is a barred spiral galaxy and is the nearest major galaxy to the Milky Way. It was originally named the Andromeda Nebula and is cataloged as Messier 31 , M31 , and NGC 224 . Andromeda has a D 25 isophotal diameter of about 46.56 kiloparsecs (152,000 light-years ) [ 8 ] and is approximately 765 kpc (2.5 million light-years ...

7. Messier 100 - Wikipedia

   en.wikipedia.org/wiki/Messier_100

   Messier 100 (also known as NGC 4321 or the Mirror Galaxy) is a grand design intermediate spiral galaxy in the southern part of the mildly northern Coma Berenices. [5] It is one of the brightest and largest galaxies in the Virgo Cluster and is approximately 55 million light-years [ 3 ] from our galaxy , about 166,000 light-years in diameter.